/**
 *  The MIT License (MIT)
 *
 *  Copyright (c) 2022 HUAWEI
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *  SOFTWARE.
 */
const { JwksClient } = require('../JwksClient');
const supportedAlg = require('./config');

export function koaJwtSecret(options = {}) {
  if (!options.jwksUri) {
    console.error('No JWKS provided. Please provide a jwksUri');
  }

  const client = new JwksClient(options);

  return function secretProvider({ alg = "", kid = "" }) {
    return new Promise((resolve, reject) => {
      if (!supportedAlg.includes(alg)) {
        return reject(new Error('Missing / invalid token algorithm'));
      }

      client.getSigningKey(kid)
        .then(key => {
          resolve(key.publicKey || key.rsaPublicKey);
        }).catch(err => {
          if (options.handleSigningKeyError) {
            return options.handleSigningKeyError(err).then(reject);
          }

          return reject(err);
        });
    });
  };
};
